I might know more but that's all I could think of that contains high pitched clean vocals.Any recommendations with links or if you're too lazy to post links just give me the names I'll check them out myself.KEEP METAL ALIVE \m/

Then you definitely have to check out Immaculate.Well, they are more thrash than prog, but 8+ minutes songs and complex arrangements should be enough Also, their upcoming album will have only two tracks lasting ~25 minutes each, so I guess they're getting more progressive.

You already know Deathrow's Deception Ignored, right? For more obscure ones, Depressive Age (dark emotive stuff sort of like Anacrusis playing German power/thrash), Skitzo (in the very melodic Realm/Toxik vicinity), Target (one their second album Mekong Delta's sci-fi loving younger cousins), Terrahsphere (pretty raw and hectic, but they've grown on me quite a bit), and Skeptic Sense (rough Watchtower-style). Also, more on the thrashy weird side ala Psychotic Waltz, there's Psycho Symphony, Garden Wall (basically only 'Forget the Colours'; their other albums are more progressive metal/rock), and Hypnotheticall (this EP is borderline as progressive/thrash and their later stuff is closer to Pain of Salvation, but it's definitely worth a shot and great stuff).

DreamOfDarkness wrote:

Also, their upcoming album will have only two tracks lasting ~25 minutes each, so I guess they're getting more progressive.

Wait what?! Atheist Crusade was already a massive step above the one before it; I don't know of any thrash band that has even tried for one 25+ minute song (Mekong Delta got close... (oh wait, I think Sabbat has done at least one, but they aren't tech)) so even if they can't exactly pull it off, it will definitely be very interesting to hear. Cross of Nero is my favorite new thrash song, so I know the potential is there.